My penis is 7 inches but its thin

the penis is NOT a normal storage site for fat so gaining weight would not do you any good, if anything it would make it look smaller next to your larger body. The sad news is that there is NOTHING you can do to grow short of a dangerous surgical procedure. Ignore all the commercials for pills, pumps, and gels. It is a matter of genetics alone and you can't change it.

That is absolute BS ive been Jelquing for two months and have akready incresed length by 1/2 an inch. THERE IS something you can do to go grow your penis its called PE

Hi smitty,
Your weight gain will not affect the size of your penis. You have to know the anatomy of the penis to understand this. Penis is like a sponge that is filled with veins. And your erection occurs when your veins get filled with blood. Now many try to enlarge the size of the penis with pills. I don’t know if you tried this. Some are successful some are not. These pills are really not really reliable and they should be used with caution.
In my opinion the better option for you is to be fit and do more exercises then gain more weight. You will not accomplish anything by gaining weight.
I hope this helped in any way.

no. weight gain will not affect your pernis, that's just something you have to live with